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| OnePlus BTE 323-এর BTE326 PCB, BFS2300 Power IC, BLE872 Battery, USB Type-C charging এবং important repair points-এর visual guide। |
OnePlus BTE 323 Bullets Wireless Neckband Circuit Details
The OnePlus BTE 323 Bullets Wireless neckband uses a compact circuit design built around a Bluetooth audio system, battery management section, USB Type-C charging input, power-management IC, microphone, tactile controls, and supporting clock circuitry.
For technicians, the most useful information is not simply the model name but the actual PCB marking and component identification. The supplied board information identifies the PCB as BTE-326 / BTE326, Version 3.2, with a reported 26 MHz crystal, BFS2300 power IC, BLE872 battery, and several other components.
OnePlus officially documents USB Type-C charging, Bluetooth connectivity, and a 10-meter effective range for its Bullets Wireless family, although specifications can differ between individual generations and models.
OnePlus BTE 323 Main Board Identification
PCB Number and Version
The referenced circuit board is identified as:
Model: OnePlus Bullets
Model Number: BTE 323
PCB Number: BTE326 / BTE-326
PCB Version: 3.2
Connectivity: Wireless
Reported Frequency Response: 20 kHz
The PCB is the main interconnection platform for the neckband. It links the battery, charging input, power-management section, Bluetooth/audio circuitry, switches, microphone, crystal oscillator, and other supporting components.
Because replacement boards can look very similar, technicians should compare the complete PCB marking and component layout before using a donor board.
OnePlus BTE 323 Charging Circuit
USB Type-C Charging Input
The neckband uses a USB Type-C connector for charging.
The supplied board information reports a 5V charging input with a stated current capability of up to 2A. The actual current drawn by the neckband is controlled by its charging circuitry and battery condition, so the 2A figure should not be interpreted as a constant charging current.
OnePlus also specifies USB Type-C charging for its Bullets Wireless products.
D4 Diode in the Charging Section
The supplied circuit identification marks D4 as a diode in the charging path.
A diode generally allows current to flow predominantly in one direction. Depending on the actual PCB topology, such a component can be used for protection, isolation, reverse-current prevention, or power-path control.
For repair work, D4 should not be replaced simply because it is labelled as a diode. Its original component type, polarity, forward-voltage characteristics, and surrounding circuit should be checked first.
Charging Current and Charging Time
The supplied repair data reports approximately 0.2A to 0.4A during the charging process and a charging period of roughly 10 to 30 minutes under the stated conditions.
The exact charging time can change according to battery state, charger, cable, temperature, battery condition, and the charging algorithm used by the board.
OnePlus BTE 323 Battery Section
BLE872 Battery Specifications
The referenced battery is identified as:
Battery Model: BLE872
Battery Type: Lithium Polymer
Battery Quantity: 1 cell
Battery Code: 1ICP4/10/40
Rated Capacity: 150mAh
Energy Rating: 0.496Wh
Normal Voltage: 3.85V
Full-Charge Voltage: 4.4V
Reported Battery Runtime: Up to 30 hours
A teardown source for the OnePlus Bullets Wireless Z family also identifies a BLE872 battery with a 0.496Wh rating, 3.85V nominal voltage, and 4.4V charge limit, which supports the battery identification in the supplied repair information.
The actual runtime of a neckband depends on factors such as volume level, Bluetooth activity, call usage, battery age, temperature, and battery health. Therefore, a reported 30-hour figure should be treated as a reference rather than a guaranteed runtime for every unit.
Battery IC Marking: 1112DAE
The battery assembly is also marked 1112DAE.
This marking should be treated carefully because publicly available information does not provide enough reliable documentation to establish every internal function of the device marked 1112DAE. It is therefore better to identify it as the battery-side control/protection marking in this particular configuration rather than assuming an undocumented datasheet specification.
Battery Wire Identification
The supplied battery wiring uses three connections:
Red: Positive battery connection
Black: Negative battery connection
Yellow: NTC temperature-sensing connection
The NTC line is important in lithium-battery systems because temperature information can be used by the charging system to adjust or stop charging when the battery temperature is outside the acceptable range.
A battery with damaged wiring or an incorrect NTC connection can therefore produce charging or startup problems even when the cell voltage itself appears normal.
OnePlus BTE 323 Charging Process
How the Charging Path Works
When a USB Type-C cable is connected, the external 5V supply enters the charging section of the PCB.
The charging and battery-management circuitry then controls the electrical conditions applied to the lithium-polymer cell. The battery voltage is monitored to ensure the charging process meets the cell's requirements.
The supplied specification identifies 3.85V as the normal battery voltage and 4.4V as the full-charge voltage. These values are consistent with the high-voltage lithium-polymer cell identification associated with BLE872.
The charging system also considers the temperature-sensing line. This is one reason a battery replacement should match the original electrical configuration rather than only matching the physical dimensions.
OnePlus BTE 323 Bluetooth Circuit
Bluetooth Version and Range
The supplied information identifies:
Bluetooth Version: 5
Reported Range: 10 meters
Audio Board Size: 12.4 mm
The Bluetooth section handles wireless communication between the neckband and a paired smartphone, tablet, or other compatible device.
OnePlus lists Bluetooth 5.0 and an effective range of up to 10 meters for its Bullets Wireless Z series.
Audio Board
The reported audio-board size is approximately 12.4 mm.
Although the board is very small, it contains or connects the major electronics required for wireless audio operation. Compact PCB construction is essential in a neckband because the available space around the control section and battery is limited.
BFS2300 Power IC Section
Power Management IC
The supplied board information identifies the following component:
Power IC: BFS2300
Reported Code: 11013908
Manufacturer Code: F09446IH
The power-management section distributes and controls electrical power for different parts of the neckband.
In practical repair work, this section becomes important when the device has symptoms such as abnormal battery drain, unstable startup, unexpected shutdown, or a power rail that is missing or excessively loaded.
A technician should measure the relevant voltage rails and inspect surrounding passive components before replacing the BFS2300.
26 MHz Crystal Oscillator
Crystal Frequency
The circuit uses a reported 26.00 MHz crystal oscillator.
A crystal provides a stable reference frequency for digital and wireless electronics. Stable clock timing is important for Bluetooth communication, processor operation, and audio-system synchronisation.
If the crystal circuit has an open connection, cracked solder joint, damaged capacitor, or other fault, the neckband may fail to start correctly or may show Bluetooth-related symptoms.
A crystal should therefore be checked as part of a systematic diagnosis rather than replaced immediately when Bluetooth stops working.
Controls and Mini Switches
Three Physical Switches
The board uses three mini tactile switches:
Power / On-Off
Volume Up
Volume Down
The reported switch dimensions are 2 × 3 × 0.6 mm.
The switches provide physical input to the control system. Pressing a button changes the electrical state of its corresponding control line, allowing the firmware to interpret commands such as power control or volume adjustment.
Switch Repair Guide
If one button stops responding while the remaining functions work normally, inspect the individual tactile switch first.
Check for cracked solder joints, mechanical damage, corrosion, contaminated contacts, and broken PCB traces. A multimeter can be used to verify whether the switch changes continuity when pressed.
Replacing the main IC should not be the first step when only a single physical button has failed.
Microphone Section
SH 007 / SH 009 Microphone
The supplied circuit information identifies the microphone as SH 007 / SH 009, with an approximate size of 4.8 × 3.8 × 1.25 mm and a 4-pin SMD configuration.
The microphone is used for voice calls and supports voice-control functions.
A 4-pin microphone should not automatically be assumed to have a specific pin assignment without checking the actual component datasheet or PCB trace layout. Different microphone designs can use different internal connections.
Microphone Repair
When Bluetooth music works correctly, but the microphone does not work during calls, inspect the microphone section separately.
Check the microphone solder joints, PCB traces, bias/supply path, signal path, and surrounding components. Moisture or mechanical impact near the microphone opening can also cause problems.
Replacing the microphone should be based on testing rather than appearance alone.
OnePlus BTE 323 Audio System
Audio Signal Processing
The audio system receives wireless audio data and converts the processed electrical signal into sound through the speaker drivers.
The compact audio PCB must handle several functions within a small physical area, including Bluetooth communication, audio processing, power management, control input, and microphone signals.
The reported 12.4 mm audio board size illustrates how compact the circuit arrangement is.
The original OnePlus Bullets Wireless product family also included dedicated audio features and Qualcomm aptX support on the original model, while later Bullets Wireless Z products use different hardware generations. Therefore, audio specifications should always be matched to the exact model rather than mixed between generations.
Problem and Solution: OnePlus BTE 323 Circuit Repair
Problem: Neckband Is Completely Dead
Start by checking the battery voltage and the physical condition of the battery wires.
Then inspect the power button, battery connection, main power rail, BFS2300 power section, and PCB for corrosion or physical damage.
If the battery is healthy but the board receives no usable power, continue tracing the power path before replacing the main electronics.
Problem: Neckband Does Not Charge
Check the USB Type-C port first.
Inspect the connector solder joints, 5V input path, D4 diode, charging section, battery connection, and NTC line.
A damaged charging connector can create an open circuit even when the external cable appears to fit correctly.
Problem: Charging Stops Immediately
Check whether the battery voltage is within a normal range and whether the NTC connection is intact.
A faulty temperature-sensing line can interfere with battery charging. Also inspect the battery itself for swelling, physical damage, or abnormal voltage behaviour.
Problem: Battery Drains Too Quickly
Start with the battery rather than the main IC.
An aged lithium-polymer cell can lose effective capacity and may show a reasonable voltage while providing much less operating time.
If a known-good battery produces the same symptom, investigate abnormal current consumption in the power-management and Bluetooth sections.
Problem: Bluetooth Does Not Connect
Check the battery supply, main power rails, crystal circuit, and PCB for physical damage.
The 26 MHz oscillator is important for stable digital and wireless operation, so it should be included in the diagnostic process.
Do not replace the Bluetooth or power IC immediately without first checking supply voltage and clock-related faults.
Problem: Buttons Do Not Work
Test the individual 2 × 3 × 0.6 mm tactile switches and their solder joints.
If one button fails while the others work, the switch or its PCB connection is a logical first target. If all controls fail simultaneously, investigate the control circuit and system power instead.
Problem: Microphone Does Not Work
Inspect the SH 007 / SH 009 microphone, its four solder connections, surrounding components, and signal path.
A damaged microphone opening, corrosion, broken trace, or poor solder joint can cause a microphone failure without affecting music playback.
Problem: Neckband Shuts Down During Use
Check battery health and operating current.
A weak battery may maintain normal voltage while unloaded but experience a significant voltage drop when Bluetooth and audio circuits draw current.
If the battery is confirmed healthy, inspect the power-management section and look for abnormal current consumption.
Step-by-Step OnePlus BTE 323 Repair Method
Step 1: Inspect the PCB
Look for liquid damage, corrosion, broken connectors, burnt components, cracked solder joints, and damaged wires.
Step 2: Test the Battery
Measure the battery voltage and verify that the battery is physically safe.
Do not continue using a swollen or damaged lithium-polymer cell.
Step 3: Verify USB Type-C Input
Check whether the expected 5V reaches the charging section when the cable is connected.
Step 4: Check the D4 Diode
Verify diode continuity and polarity with the circuit powered down when appropriate.
If the diode is shorted or open, compare its characteristics with the original component before replacement.
Step 5: Check the NTC Connection
Verify the yellow temperature-sensing wire and its corresponding PCB connection.
A missing or incorrect temperature-sense signal can affect charging behavior.
Step 6: Check the Power Section
Measure the relevant power rails around the BFS2300 area and inspect nearby components for shorts or damage.
Step 7: Check the Crystal Circuit
Inspect the 26 MHz crystal and its solder joints and supporting components when startup or Bluetooth problems occur.
Step 8: Test the Audio and Control Sections
Check the microphone, switches, speaker connections, and Bluetooth operation independently. This prevents a local component fault from being mistaken for a motherboard failure.
OnePlus BTE 323 Component Reference
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Official OnePlus Repair and Product Information
OnePlus provides official product information for its Bullets Wireless family, including charging, Bluetooth, controls, and product specifications. Its official support ecosystem also provides repair and technical-support information.
Official OnePlus: https://www.oneplus.in/
Note: Always verify the exact PCB revision, component markings, battery wiring, and measured voltages before replacing any part.
Disclaimer: The board-level specifications above combine the supplied BTE 323 repair information with verified reference information, and individual PCB revisions may differ; use proper lithium-battery and electronics safety procedures during repair.
